main.c

来自「最新版IAR FOR ARM（EWARM）5.11中的代码例子」· C语言 代码 · 共 113 行

/******************** (C) COPYRIGHT 2003 STMicroelectronics ********************
* File Name          : main.c
* Author             : MCD Application Team
* Date First Issued  : 16/05/2003
* Description        : This program shows how to use the WDG software
*                      library.
********************************************************************************
* History:
* 13/01/2006   : V3.1
* 24/05/2005   : V3.0
* 30/11/2004   : V2.0
* 16/05/2003   : Created
*******************************************************************************
 THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH
 CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
 AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, INDIRECT
 OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT
 OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION
 CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

#include "71x_lib.h"


#define EXAMPLE_1
       /*  Free running Timer Mode */
//#define EXAMPLE_2       /*  WDG Mode */
#define Refresh_Time 920

int main(void)
{
#ifdef EXAMPLE_2
  u16 counter=0xFFFF;
  u8 count=0xFF;
#endif

#ifdef DEBUG
  debug();
#endif

#ifdef EXAMPLE_1
/*****************************************************************************
*Example 1: Free running Timer mode
******************************************************************************/
  /* GPIO peripheral configuration ------------------------------------------*/

  GPIO_Config (GPIO1, 0x0100, GPIO_OUT_PP);
  GPIO_BitWrite(GPIO1,8,1);

  /* WDG peripheral configuration -------------------------------------------*/
  /* Disable the end if count interrupt */
  WDG_ECITConfig (DISABLE);
  /* Stop the free auto-reload timer to count down */
  WDG_CntOnOffConfig (DISABLE);
  /* Set the prescaler and counter reload value based on the needed time */
  WDG_PeriodValueConfig (49380);	/*  49.380 ms */

  /* EIC peripheral configuration -------------------------------------------*/
  /* The interrupt handler toggles an I/O port */
  /* Configure the WDG_IRQChannel priority */
  EIC_IRQChannelPriorityConfig(WDG_IRQChannel, 1);
  /* Enable the WDG_IRQChannel */
  EIC_IRQChannelConfig(WDG_IRQChannel, ENABLE);
  /* Enable IRQ interrupts */
  EIC_IRQConfig(ENABLE);
  /* Enable the end of count interrupt */
  WDG_ECITConfig (ENABLE);
  /* The free auto-reload timer starts to count down */
  WDG_CntOnOffConfig (ENABLE);
  while(1); /*  infinite loop */
#endif /* EXAMPLE_1 */


#ifdef EXAMPLE_2
/*****************************************************************************
*Example 2: Watchdog mode
******************************************************************************/

  /* GPIO peripheral configuration -------------------------------------------*/

  GPIO_Config (GPIO1, 0x0100, GPIO_OUT_PP);
  GPIO_BitWrite(GPIO1,8,0);

  /* WDG peripheral configuration -------------------------------------------*/
  /* Set the counter prescaler value */
  WDG_PrescalerConfig (0xFF);
  /* Configure the counter pre-load value */
  WDG_CntReloadUpdate (Refresh_Time);

  while(counter--);
  /* Enable the watchdog mode */
  WDG_Enable();

  while(1)
  {
   GPIO_BitWrite(GPIO1,8,1);
    while(count--);
    count=0xFF;
    GPIO_BitWrite(GPIO1,8,0);
    while(count--);
    count=0xFF;
    if(++counter==50)
    {
      counter=0;
/* Refresh and update the watchdog counter in order to avoid a system reset */
      WDG_CntRefresh();
    }
  }
#endif /* EXAMPLE_2 */
}

/******************* (C) COPYRIGHT 2003 STMicroelectronics *****END OF FILE****/